curl_multi_exec fails on Mac OS X - php

Question

I'm trying to run this simple piece of code from php.net under my Mac OS X (Mavericks) to try cURL multi exec feature :
<?php
// create both cURL resources
$ch1 = curl_init();
$ch2 = curl_init();
// set URL and other appropriate options
curl_setopt($ch1, CURLOPT_URL, "http://lxr.php.net/");
curl_setopt($ch1, CURLOPT_HEADER, 0);
curl_setopt($ch2, CURLOPT_URL, "http://www.php.net/");
curl_setopt($ch2, CURLOPT_HEADER, 0);
//create the multiple cURL handle
$mh = curl_multi_init();
//add the two handles
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);
$active = null;
//execute the handles
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($active && $mrc == CURLM_OK) {
if (curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
//close the handles
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);
?>
That does not work as the only output I got is :
PHP Fatal error: Maximum execution time of 30 seconds exceeded in
This is my environment: Mac OS X 10.9, PHP 5.4.17, Apache 2.2.24.
cUrl is installed as I my regular curl "single" requests work great.
I think this is an issue with Mac OS but I can't find any fix. Do you have any idea?
EDIT: I tried the same code on a Linux server and everything worked fine.

Answer 1

On php 5.3.18+ be aware that curl_multi_select() may return -1 forever until you call curl_multi_exec().
Try this:
while ($this->active && $mrc == CURLM_OK)
{
// add this line
while (curl_multi_exec($this->mh, $this->active) === CURLM_CALL_MULTI_PERFORM);
if (curl_multi_select($this->mh) != -1)
{
do {
$mrc = curl_multi_exec($this->mh, $this->active);
if ($mrc == CURLM_OK)
{
while($info = curl_multi_info_read($this->mh))
{
$this->process($info);
}
}
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
See https://bugs.php.net/bug.php?id=63411 or http://marchtea.com/?p=109 for more information.